No, it’s not possible to have more than 200 pictures in one album.
Only the default album “Wall photos” allows you to have more than 200 pictures but no way it will allow you 600. Yes in some cases 228 or 344; the number can vary. But if you try to upload too many photos in that wall photos it can block you from uploading more pictures for some time.
Then you can always rename the album “Wall photos” to whichever name you like.

I’m still waiting for Facebook to roll out those changes where one can upload as many photos in one album as he/she wants.
There’s just no point having multiple albums for one occasion..!

I’ve experienced one. And it reached upto 1000 photos in one album. My friends were shocked on how I did it. But all I can say to them is that it just happened that way and have no idea how it become like that.

I’m really looking forward to have a photo album that has a capacity of 1000 photos again or more.

My very first “mobile uploads” album has 999 photos in it, until I eventually just started a new album because that one was taking too long to load. I have no idea how it happened though…just a glitch.